Here is how you may want to tune up your WordPress website performance i.e. how much time it takes to download your website from server to your visitors’ computer, mobile or tablet.
But here is simple way out of this problem.
Important Note: Compressing, Minifying or Deferring Files may have adverse effect on functionality of website because of dependencies so first do following steps on your local server if everything looks to be working fine then you can update same files on Live servers. Just for safety & security purposes.
Here is example:
When you ‘Analyse’ your website on Google PageSpeed you get warning something like this:
Your page has 4 blocking script resources and 8 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.